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That sounds like a bad business requirement.
It is possible to place a querystring on images that contains a unique id so that your server log can record the ip address from which the image is being fetched.

Recording the destination of forwarded email isn't viable, but you should be able to run the logs through a scanner to check for a unique id being accessed by multiple id addresses. Investigations could then occur from that information.

That sounds like a bad business requirement.
It is possible to place a querystring on images that contains a unique id so that your server log can record the ip address from which the image is being fetched.

How dya do that? I could dream up other ways, but not sure what/how is this querything ?

Recording the destination of forwarded email isn't viable, but you should be able to run the logs through a scanner to check for a unique id being accessed by multiple id addresses. Investigations could then occur from that information.

If you really think that, would you possibly have time to go to www.bigstring.com (.com?/.net?) and figure out how they do it for us, please? My account there tells me about receipts and forwards - maybe even bcc s , not sure. How do they make the emails expire and disintegrate? How do you make a self-destructing video email? Enquiring minds...

How you make a self-destructing video email is to host the video yourself, and have the server provide the video based on a special identifier. The server checks that its database record for that identifier indicates that the video hasn't yet been watched.

Once the video has been watched the server would then flag that identifier in their database as being read. If the video is requested again, it checks the database for that identifier and seeing that it has already been watched, won't allow you to watch it again.

That is the kind of technique that should be use perform that type of behaviour.

As to the non-ability to save or print, just try sending an email from bigstring.com to a webmail account like gmail and you will find that you are able to perform those tasks. Even in the FAQ it says that you can't prevent printing in Outlook 2007.

They're trying to provide a fancy service, but it's all smoke and mirrors. Their ability to provide security is severly limited to one or two email clients.

What about self destructing email? Haven't tried it. I can send a message to a yahoo account and see if it's been read. Can't remember if I tried forwarding a message to myself to another account of mine or someone else to see if the IP shows up, but bigstring claims it's doable. I only tried it once on a real person to catch a spy, but they could've just cut the message and pasted it in a new composition rather than forwarding it. So much for detecting a fwd in that case.